Mmhh...I'm afraid it's going to be tough!
First, mGalaxy doesn't use background images !
We have info to display, we have a scrolling list, a screenshot, etc...and we thing that it won't be readable enough over such a background
(...plus, we think - just a point of view - that this style: elements over a background image...isn't that cool! Even if we think that the images you've chosen are great image and that you made a good choice!
)
We could go the 3D way (or pseudo 3D), a preferred way for us!
BUT, there's also the problem of the screenshot representing themselves part of the slot machine!
The best we could do there is use a machine like this one and display the screenshots on the main screen of the machine!
Would it be acceptable for you?
I can see on your machine that ideally the theme should be vertical?
Here's is what we can propose you! Does it sound a good way to go for you?
PS: I suppose that there's no movies as we can find for mame for fruit machines? So there would just be images to be displayed, is that correct?